Nemacerota sejilaa Pan, Ronkay, Ronkay & Han

Pan, Zhao-Hui, Ronkay, Gábor, Ronkay, László & Han, Hui-Lin, 2014, A new species of Nemacerota Hampson, [1893] (Lepidoptera, Thyatiridae) from Tibet, China, Zootaxa 3754 (1), pp. 97-100 : 97-100

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Nemacerota sejilaa Pan, Ronkay, Ronkay & Han

sp. n.

Nemacerota sejilaa Pan, Ronkay, Ronkay & Han   sp. n.

( Figs 1–2, 5 – 7, 9 View FIGURES 1 – 6 View FIGURES 7 – 10 )

Material examined. Holotype. Male, Autonomous Region Xizang, Linzhi, Kadinggou, altitude 3000m, 31 VII 2013 (leg. HL Han, ZG Wu). Paratypes. 1 male, Autonomous Region Xizang, Linzhi, 28–30 VIII 2012 (leg. Zhaohui Pan), slide no. hhl- 2785 - 1; 2 females, Autonomous Region Xizang, Linzhi, Mt. Sejila, altitude 3400m, 2 VIII 2013 (leg. HL Han, ZG Wu), slide no. hhl- 2838 - 2; 1 male, Autonomous Region Xizang, Linzhi, Mt. Sejila, altitude 4300m, 4 VIII 2013 (leg. HL Han, ZG Wu). Type material is deposited in the collection of the Northeast Forestry University ( NEFU), Harbin, China.

Diagnosis. This new species is externally close to N. igorkostjuki Laszlo, Ronkay, Ronkay& Witt, 2007   and N. decorata (Sick, 1941)   , but can be distinguished by the light gray and broad forewing; postmedial line smoothly incurved above vein M 2, then slightly straight to inner margin without curving out towards tornus which is typical of both N. igorkostjuki   and N. decorata   . In N. igorkostjuki   ( Figs 3–4 View FIGURES 1 – 6 ) and N. decorata   , the postmedial line runs from the costa inward straight to M 1, cambered outward between M 1 and Cu 2, then outward to tornal area. In addition, the reniform stigma of N. sejilaa   is long, narrow and kidney-shaped, whereas in N. igorkostjuki   it is short and more broadly round. The male genitalia of the three species are rather similar, but display several clearly recognizable differences. The socii of N. sejilaa   ( Fig. 7 View FIGURES 7 – 10 ) are much thinner and longer than in N. igorkostjuki   ( Fig. 8 View FIGURES 7 – 10 ) and N. decorata   ( Laszlo et al 2007: gen. fig. 93); the sacculus has a weakly sclerotized process, which is reduced in N. igorkostjuki   and differently shaped in N. decorata   ; the fultura superior of the new species is considerably more slender than in N. igorkostjuki   (especially in its ventral section) and narrower although less conspicuously than in N. decorata   ), and the saccular margin is almost straight which is somewhat concave in N. igorkostjuki   . The aedeagus of N. sejilaa   is slenderer than in the two related species, slightly curved medially, and the basal part of the carinal hook has sclerotized lateral lobe which is missing in N. igorkostjuki   . In the female genitalia, the size and sclerotization of the ostium bursae is different in the three species: that of N. sejilaa   ( Fig. 9 View FIGURES 7 – 10 ) is larger and more cup-shaped than in N. igorkostjuki   ( Fig. 10 View FIGURES 7 – 10 ), but smaller and more flat than in N. decorata   ( Laszlo et al 2007: gen. fig. 93). The tubular part of the corpus bursae of the new species is similar to that of N. decorata   , but considerably shorter and less coiled than that of N. igorkostjuki   ( Fig. 10 View FIGURES 7 – 10 ).

Description. External appearance ( Figs 1–2 View FIGURES 1 – 6 ). Wingspan 42–46 mm. Antennae bipectinate in male, comparatively thin in female; head, palpi and thoracic pubescence generally gray, mixed with whitish and blackish scales; thorax with black dorsal lines on tegulae; abdomen gray-brown. Ground colour of forewing silvery ash-gray; basal band thin and black; subbasal line double, waved, dark grey filled with ground colour; antemedial line sharply defined and less sinuous, black, defined by red scales, double with interior line stronger; median line rather indistinct, shadow-like, grey. Outer half of basal field suffused with dark brownish grey, median area bright grey; postmedial line black, double, with indistinct interior line; termen with dark blackish-grey subapical patch followed with whitish-grey costal spot of subterminal line; marginal area with fine dark lines on veins; subterminal line pale whitish-grey, waved, gradually tapering from costa to inner margin; terminal line deep black; fringes as ground colour, chequered with black patches at veins. Reniform stigma elongate, more or less kidney-shaped; orbicular stigma obsolescent, small and rounded, whitishgrey. Hindwing lighter than forewing, pale whitish-grey with fine ochreous-pinkish hue; transverse line broad, diffuse, darker grey; marginal area deeper grey with ochreous shade along black terminal line; fringes whitish, chequered with blackish; inner margin with long ochreous-brown hair-scales. Male genitalia ( Fig. 7 View FIGURES 7 – 10 ). Uncus long, strong and straight, twice as long as socii; socii thin, finely arched inwards. Tegumen broad and rather short; fultura superior sclerotized, cuneate-lanceolate with narrow basal (ventral) portion; dorsal part of juxta reversed triangular with V-shaped marginal sclerotisation; vinculum U-shaped with well-developed saccus. Valvae rather broad, with apex rounded; sacculus narrow, thick, shorter than half length of valva, with small and sclerotized process of harpe; costa with broad triangular sclerotisation. Aedeagus slightly curved at middle, long and narrow, with strongly sclerotized, thick, falcate hook of carina; vesica broadly tubular, tapering distally, everted dorsad and recurved ventrad, without cornuti band. Female genitalia ( Fig. 9 View FIGURES 7 – 10 ). Papillae anales short, broad, loose-bodied apically. Apophyses posteriores relatively shorter, ca 2 / 3 as long as apophyses anteriores. Ductus bursae short, membranous; cervix bursae narrow, weakly screwy at anterior part; tubular distal part of corpus bursae with one full coil; proximal part of corpus bursae oblong, with weakly sclerotized signum.

Etymology. The species name “ sejilaa   ” refers to the type locality, Mt. Sejila.

Distribution and Bionomics. The new species occurs in China, Xizang: Mt. Sejila ( Fig. 5 View FIGURES 1 – 6 ). Bionomics ( Fig. 6 View FIGURES 1 – 6 ). It inhabits the coniferous forest zone with high montane shrubby regions dominated by Rhododendron   stands above 3000 m in the Southeast part of the Autonomous Region Xizang (Tibet) in the south-eastern Himalayas ( Fig. 6 View FIGURES 1 – 6 ). Adults are on the wing from late July to late August.